body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #004d40; /* 深绿色背景 */
  color: white;
}

header {
  background-color: #00695c; /* 深绿色背景 */
  padding: 10px 0;
  display: flex; /* 使用flex布局 */
  align-items: center; /* 垂直居中 */
}

#header-content {
  display: flex; /* 使用flex布局 */
  align-items: center; /* 垂直居中 */
  justify-content: space-between; /* 水平两端对齐 */
  padding: 0 20px; /* 左右内边距 */
}

#top {
  max-width: 100px; /* 图片最大宽度，可根据需要调整 */
  height: auto; /* 图片高度自动 */
}

h1 {
  margin: 0; /* 移除标题的外边距 */
}

nav {
  background-color: #00796b; /* 深绿色背景 */
  overflow: hidden;
}

nav a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

nav a:hover {
  background-color: #004d40;
}

section.content {
  display: flex;
  justify-content: space-between;
}

.aside-left, .aside-right, .main {
  background-color: #00796b; /* 深绿色背景 */
  color: white;
  padding: 10px;
  margin: 10px;
  flex: 1;
}

.aside-left {
  order: 1;
}

.main {
  order: 2;
}

.aside-right {
  order: 3;
}

.aside-left a, .aside-right a {
  display: block;
  color: white;
  text-decoration: none;
  padding: 10px 0;
  border: none; /* 移除边框 */
}

.aside-left a:hover, .aside-right a:hover {
  background-color: #004d40;
}

#main-content a {
  display: block;
  color: white;
  text-decoration: none;
  padding: 10px 0;
  border: none; /* 移除边框 */
}

#main-content a:hover {
  background-color: #004d40;
}

footer {
  background-color: #00695c; /* 深绿色背景 */
  color: white;
  text-align: center;
  padding: 10px 0;
  position: relative;
  bottom: 0;
  width: 100%;
}

footer a {
  color: white;
  text-decoration: none;
}

footer a:hover {
  color: #00796b;
}